diff options
author | Paul Davis <paul@linuxaudiosystems.com> | 2008-06-02 21:41:35 +0000 |
---|---|---|
committer | Paul Davis <paul@linuxaudiosystems.com> | 2008-06-02 21:41:35 +0000 |
commit | 449aab3c465bbbf66d221fac3d7ea559f1720357 (patch) | |
tree | 6843cc40c88250a132acac701271f1504cd2df04 /libs/ardour/resampled_source.cc | |
parent | 9c0d7d72d70082a54f823cd44c0ccda5da64bb6f (diff) |
rollback to 3428, before the mysterious removal of libs/* at 3431/3432
git-svn-id: svn://localhost/ardour2/branches/3.0@3435 d708f5d6-7413-0410-9779-e7cbd77b26cf
Diffstat (limited to 'libs/ardour/resampled_source.cc')
-rw-r--r-- | libs/ardour/resampled_source.cc | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/libs/ardour/resampled_source.cc b/libs/ardour/resampled_source.cc new file mode 100644 index 0000000000..083fde95a1 --- /dev/null +++ b/libs/ardour/resampled_source.cc @@ -0,0 +1,128 @@ +/* + Copyright (C) 2007 Paul Davis + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + +*/ + +#include <pbd/error.h> +#include <ardour/resampled_source.h> +#include <pbd/failed_constructor.h> + +#include "i18n.h" + +using namespace ARDOUR; +using namespace PBD; + +const uint32_t ResampledImportableSource::blocksize = 16384U; + +ResampledImportableSource::ResampledImportableSource (boost::shared_ptr<ImportableSource> src, nframes_t rate, SrcQuality srcq) + : source (src) +{ + int err; + + source->seek (0); + + /* Initialize the sample rate converter. */ + + int src_type = SRC_LINEAR; + + switch (srcq) { + case SrcBest: + src_type = SRC_SINC_BEST_QUALITY; + break; + case SrcGood: + src_type = SRC_SINC_MEDIUM_QUALITY; + break; + case SrcQuick: + src_type = SRC_SINC_FASTEST; + break; + case SrcFast: + src_type = SRC_ZERO_ORDER_HOLD; + break; + case SrcFastest: + src_type = SRC_LINEAR; + break; + } + + if ((src_state = src_new (src_type, source->channels(), &err)) == 0) { + error << string_compose(_("Import: src_new() failed : %1"), src_strerror (err)) << endmsg ; + throw failed_constructor (); + } + + src_data.end_of_input = 0 ; /* Set this later. */ + + /* Start with zero to force load in while loop. */ + + src_data.input_frames = 0 ; + src_data.data_in = input ; + + src_data.src_ratio = ((float) rate) / source->samplerate(); + + input = new float[blocksize]; +} + +ResampledImportableSource::~ResampledImportableSource () +{ + src_state = src_delete (src_state) ; + delete [] input; +} + +nframes_t +ResampledImportableSource::read (Sample* output, nframes_t nframes) +{ + int err; + + /* If the input buffer is empty, refill it. */ + + if (src_data.input_frames == 0) { + + src_data.input_frames = source->read (input, blocksize); + + /* The last read will not be a full buffer, so set end_of_input. */ + + if ((nframes_t) src_data.input_frames < blocksize) { + src_data.end_of_input = true; + } + + src_data.input_frames /= source->channels(); + src_data.data_in = input; + } + + src_data.data_out = output; + + if (!src_data.end_of_input) { + src_data.output_frames = nframes / source->channels(); + } else { + src_data.output_frames = src_data.input_frames; + } + + if ((err = src_process (src_state, &src_data))) { + error << string_compose(_("Import: %1"), src_strerror (err)) << endmsg ; + return 0 ; + } + + /* Terminate if at end */ + + if (src_data.end_of_input && src_data.output_frames_gen == 0) { + return 0; + } + + src_data.data_in += src_data.input_frames_used * source->channels(); + src_data.input_frames -= src_data.input_frames_used ; + + return src_data.output_frames_gen * source->channels(); +} + |